Ban on feeding cows dope

Switzerland's Agriculture Ministry has called on the country's farmers to stop feeding their cows cannabis.

Several recent adverts have promoted feeding hemp to farm animals even after a March 2005 law banning its use.

The Agriculture Ministry has now warned that farmers doping their cows will be prosecuted.

Farmers consider the cheap and easy to grow plant is good for their cows.

They believe the active ingredient in cannabis, THC, makes cows happy and produce more milk, but the Agriculture Ministry say THC can get into the milk and create a health risk.

They also said that there was a risk that Swiss cheese products could be contaminated.